[Bloat] Really getting 1G out of ISP?

[Wheelock, Ian]

The support for AQM (PIE) is mandatory in D3.1 modems regardless of the US mode in use (ie sc-qam (3.0) or ofdma (3.1) upstream), so it should be enabled.

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________________________________
From: Bloat <bloat-bounces at lists.bufferbloat.net> on behalf of Aaron Wood <woody77 at gmail.com>
Sent: Tuesday, July 6, 2021 11:13:59 PM
To: Livingood, Jason <Jason_Livingood at comcast.com>
Cc: bloat at lists.bufferbloat.net <bloat at lists.bufferbloat.net>
Subject: Re: [Bloat] Really getting 1G out of ISP?

Are these in-flux changes to where the upstream split is why some modems report DOCSIS 3.1 downstream, but only 3.0 upstream? (and therefore aren't enabling AQM on the upstream?) -Aaron  ‌  ‌  ‌  ‌  ‌  ‌  ‌
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Are these in-flux changes to where the upstream split is why some modems report DOCSIS 3.1 downstream, but only 3.0 upstream?  (and therefore aren't enabling AQM on the upstream?)

-Aaron

On Tue, Jun 22, 2021 at 4:04 PM Livingood, Jason via Bloat <bloat at lists.bufferbloat.net<mailto:bloat at lists.bufferbloat.net>> wrote:
> For DOCSIS the issue seems to be an unfortunate frequency split between up and downstream and use of lower efficiency coding schemes.

Performance really takes a big step forward once a person has a D3.1 modem in their home, bringing OFDM and OFDMA as key advancements. Also in flux at the moment is where the upstream split is in cable networks, which are moving to mid-split or high-split designs that bring more upstream bandwidth. As well, over the past 18+ months, most cable networks have added substantially more upstream channels as well as performed quite a number of fiber node splits. And that is just below the physical layer stuff - there's also a lot of work at the software layer for modems and CMTSes that is quite interesting.

JL

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